import cgi

from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db

class Greeting(db.Model):
    
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateProperty(auto_now_add=True)
    

class MainPage(webapp.RequestHandler):
    
    def get(self):

        
        user = users.get_current_user()
        
        if user:
            self.response.out.write("""
            
            <a href="%s">Log Out</a>
            <br>
            """ % users.CreateLogoutURL(self.request.uri))
        else:
            self.response.out.write("""
            
            <a href="%s">Log In</a>
            <br>
            """ % users.CreateLoginURL(self.request.uri))
        
        greetings = db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC LIMIT 10")
        
        for greeting in greetings:
            if greeting.author:
                self.response.out.write('<b>%s</b> wrote:' % greeting.author.nickname())
            else:
                self.response.out.write('An anonymous person wrote:');
            
            self.response.out.write('<blockquote>%s</blockquote>' % cgi.escape(greeting.content))
        
        
        self.response.out.write("""
              <form action="/sign" method="post">
                <div><textarea name="content" rows="3" cols="60"></textarea></div>
                <div><input type="submit" value="Post"></div>
              </form>
            </body>
          </html>
        """)
    
class Guestbook(webapp.RequestHandler):
    def post(self):
        greeting = Greeting()
        
        if users.get_current_user():
            greeting.author = users.get_current_user()
        
        greeting.content = self.request.get('content')
        greeting.put()
        
        self.redirect('/')

application = webapp.WSGIApplication([
                                      ('/', MainPage),
                                      ('/sign', Guestbook)
                                      ], debug=True)


def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()
